EP0492148B1 - Verfahren und Vorrichtung zur Kristallisation von Schmelzen - Google Patents

Verfahren und Vorrichtung zur Kristallisation von Schmelzen Download PDF

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Publication number
EP0492148B1
EP0492148B1 EP91120108A EP91120108A EP0492148B1 EP 0492148 B1 EP0492148 B1 EP 0492148B1 EP 91120108 A EP91120108 A EP 91120108A EP 91120108 A EP91120108 A EP 91120108A EP 0492148 B1 EP0492148 B1 EP 0492148B1
Authority
EP
European Patent Office
Prior art keywords
belt
fused mass
melt
wall
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91120108A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0492148A1 (de
Inventor
Konrad Schermutzki
Herbert Dr. Ing. Würmseher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Santrade Ltd
Original Assignee
Santrade Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Santrade Ltd filed Critical Santrade Ltd
Publication of EP0492148A1 publication Critical patent/EP0492148A1/de
Application granted granted Critical
Publication of EP0492148B1 publication Critical patent/EP0492148B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0004—Crystallisation cooling by heat exchange
    • B01D9/0013—Crystallisation cooling by heat exchange by indirect heat exchange
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/004—Fractional crystallisation; Fractionating or rectifying columns

Definitions

  • the invention relates to a method and a device for the crystallization of melts, in which at least one wall which can be cooled to a temperature below the crystallization point of the melt is provided, with which the melt comes into contact and on which the crystal formation takes place.
  • a continuous procedure for the formation of crystals is also known from FR-A 1 220 220.
  • melt is applied to the upper run of an endless belt running obliquely upwards, a cooling device being located below this upper run. Crystals therefore form on the belt and are heated at the top dead center of the upper deflecting roller of the belt, so that the substance separated from the applied mixture by crystallization can drip off at the end of the belt and be collected.
  • the residual melt runs to the other side due to the slant of the belt. As the church stall and residual melt are on the same belt, the effectiveness in obtaining pure substances can be impaired.
  • FR-A 2 182 168 also discloses a continuously operating device for obtaining solid substance from liquid phases, in which a shaft for the liquid phase to be fed in has been formed by four bands forming a rectangle, each of which forms the inner run of endless belts. At least two opposite strands are cooled or heated from the inside of the endloden belts and their direction of rotation is selected such that the strands of the belts forming the shaft wall are moved downward. Down the shaft is continued by a closed chamber, which has a closure in the form of a grinder. The crystals that form as a result of the cooling on the downward moving walls are therefore fed to the grinder and ground into small pieces. The residual melt also reaches the grinder and can impair the removal of the pure crystals.
  • the present invention is based on the object of designing a method and a device of the type mentioned at the outset such that on the one hand a continuous removal of the crystallized product and on the other hand a defined one Removal of residual melt is possible so that the crystals obtained cannot be impaired.
  • moving walls are provided, one of which is provided with the melt and the other is the coolable wall that is in contact with the surface of the Melt is brought so that a crystal layer can be pulled off the surface of the melt from one wall and can be continuously removed in the opposite direction to the residual melt discharged with the other wall.
  • This configuration makes it possible to pull off a crystal layer from the surface of a melt on one side, so that the crystal layer which has been removed can then be continuously removed and further processed.
  • the residual melt is discharged to the opposite side, from where it can also be reprocessed and, if necessary, fed back into the process.
  • a device is particularly suitable for carrying out the method according to the invention.
  • the melt can be introduced from one side into the gap of the mutually facing strands and runs with the carrier tape in one direction while the strand of the strip above which comes into contact with the surface of the melt at the upper boundary of the gap runs counter to the carrier strip and pulls a crystal layer from the melt, which then becomes easier Way can be removed from the belt by a known removal device.
  • the residual melt can in turn be removed from the carrier tape on the opposite side.
  • a stripping device for the residual melt can also be assigned to the lower carrier belt on its rear deflecting roller, which in turn can be assigned a collecting device according to Claim 11, so that the residual melt can be assigned via a Remelting device can be returned to the feed device.
  • the temperature control and the cooling device can each be designed as a spray nozzle arrangement, or the like with a corresponding liquid, for example with water or with cooling soles. can work.
  • the invention is shown schematically in the drawing using an exemplary embodiment.
  • the only drawing shows a device for performing the method according to the invention.
  • the drawing shows a double belt system consisting of a lower belt (1) and an upper belt (2), both of which are guided around deflection rollers (3, 3a) and (4, 4a).
  • deflection rollers (3, 3a) and (4, 4a) are horizontal.
  • the lower belt (1) which, like the upper belt (2), is an endless belt and can, for example, be a steel belt, is slightly longer than the upper belt (2) and has on its upper run (1a) before the deflection roller ( 4) of the upper belt (2) an area in which a feed device (6) for a melt (7) is provided, which is formed by melting a crystallizable material.
  • the feed device (6) can be a feed tube provided on its underside with a slot, which runs transversely to the direction of belt travel (8) of the lower belt (1).
  • a known strip caster or a device for applying the melt in drop form could also be provided.
  • the upper belt (2) has a running direction (9) which has the same direction of rotation as that of the lower belt.
  • Both the lower belt (1) and the upper belt (2) are assigned a spray device provided with a plurality of spray nozzles (10 or 11) within the belt circulation, each of which is arranged within a cover (12 or 13) so that the upper strand ( 1a) of the lower belt (1) from below and the lower run (2a) of the upper belt (2) from above with a liquid which is sprayed onto the lower spray nozzles (10) via a schematically indicated line system (14) and the spray nozzles (11) a line system (15) is supplied, which is connected to a liquid circuit laterally from the endless belts in a manner not shown.
  • the liquid supplied to the line system (14) is at a temperature held, which corresponds to a near the crystallization point of the melt (7), but still slightly lower temperature than that of the crystallization point.
  • the line system (15), on the other hand, is supplied with a cooling liquid, the temperature of which is below the temperature of the crystallization point of the melt (7).
  • the melt is kept at a certain, previously mentioned temperature via the upper strand (1a), while the surface of the melt (7) coming into contact with the lower strand (2a) of the upper belt (7) is strongly cooled within the gap (16) , so that starting at the lower strand (2a) in the area behind the deflecting roller (4a), a crystallization layer from the melt (7) will attach, which is in the conveying direction (9) of the upper belt (2), ie opposite to the feed direction (8 ) the melt (7) is led out of the gap (16).
  • a removal device (18) for example by a scraping knife, and indicated schematically Transport device (19) are given, which can remove the removed crystal layer, which crumbles when removed, laterally out of the area of the circulating belts (1 and 2) for further processing.
  • the deflection roller (3a) of the lower belt (1) is assigned a stripping device (20), for example in the form of a spatula or the like, with which the residual melt (7 ') is removed from the end region of the lower belt (1) and into a Collection device (21) can be performed. From this collecting device (21), the melt can be melted via a schematically indicated heat exchanger (22) for re-melting and for reaching the original feed temperature via a return line (23) can be returned to the feed device (6).
  • a schematically indicated heat exchanger (22) for re-melting and for reaching the original feed temperature via a return line (23) can be returned to the feed device (6).
  • the collecting device (21) itself with a heat exchanger in order to achieve the recovery of the residual melt.
  • the method carried out on the basis of the device shown in the drawing permits continuous production of a crystallizate and the continuous extraction thereof for the purpose of further processing.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Structure Of Belt Conveyors (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Cephalosporin Compounds (AREA)
EP91120108A 1990-12-22 1991-11-26 Verfahren und Vorrichtung zur Kristallisation von Schmelzen Expired - Lifetime EP0492148B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4041670 1990-12-22
DE4041670A DE4041670C1 (it) 1990-12-22 1990-12-22

Publications (2)

Publication Number Publication Date
EP0492148A1 EP0492148A1 (de) 1992-07-01
EP0492148B1 true EP0492148B1 (de) 1995-02-01

Family

ID=6421361

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91120108A Expired - Lifetime EP0492148B1 (de) 1990-12-22 1991-11-26 Verfahren und Vorrichtung zur Kristallisation von Schmelzen

Country Status (8)

Country Link
EP (1) EP0492148B1 (it)
JP (1) JPH04293502A (it)
CN (1) CN1031104C (it)
AT (1) ATE117906T1 (it)
DE (2) DE4041670C1 (it)
ES (1) ES2067836T3 (it)
GR (1) GR3015367T3 (it)
RU (1) RU2074050C1 (it)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4415844A1 (de) * 1994-05-05 1995-11-16 Santrade Ltd Verfahren und Vorrichtung zur Stofftrennung durch Kristallisation von Schmelzen
DE19724461A1 (de) * 1997-06-10 1998-12-17 Basf Ag Verfahren zur Herstellung von verbackungsfreien Hydroxipivalinsäureneopentylglykolester- Granulaten

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1220220A (fr) * 1958-02-06 1960-05-23 Procédé pour séparer totalement ou partiellement les constituants d'un milieu liquide

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2651922A (en) * 1949-09-02 1953-09-15 Phillips Petroleum Co Crystallization process and apparatus
DE1193474B (de) * 1959-04-21 1965-05-26 Kaiser Geb Vorrichtung zur UEberfuehrung von Schmelzen, die auf einem endlosen Stahlband in horizontaler Richtung transportiert werden, in den festen Zustand
US3405209A (en) * 1964-07-06 1968-10-08 American Cyanamid Co Method of drum flaking a difficultly crystallizable material
AT279547B (de) * 1967-04-14 1970-03-10 Buchs Metallwerk Ag Verfahren und Vorrichtung zur Trennung oder Reinigung schmelzflüssiger, flüssiger oder gelöster Stoffe durch fraktioniertes Kristallisieren
CH571887A5 (it) * 1972-04-27 1976-01-30 Ciba Geigy Ag
DE3116277A1 (de) * 1981-04-24 1982-11-04 Santrade Ltd., 6002 Luzern Kristallisiereinrichtung
FI70376C (fi) * 1984-07-04 1986-09-19 Neste Oy Foerfarande och anordning foer separering eller rening av organiska aemnen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1220220A (fr) * 1958-02-06 1960-05-23 Procédé pour séparer totalement ou partiellement les constituants d'un milieu liquide

Also Published As

Publication number Publication date
DE59104489D1 (de) 1995-03-16
RU2074050C1 (ru) 1997-02-27
CN1031104C (zh) 1996-02-28
CN1062669A (zh) 1992-07-15
EP0492148A1 (de) 1992-07-01
JPH04293502A (ja) 1992-10-19
GR3015367T3 (en) 1995-06-30
ES2067836T3 (es) 1995-04-01
DE4041670C1 (it) 1992-07-30
ATE117906T1 (de) 1995-02-15

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